Thomas Gleixner wrote: > Problem description at: > http://bugzilla.kernel.org/show_bug.cgi?id=8048 > > Commit b18ec80396834497933d77b81ec0918519f4e2a7 > [PATCH] sched: improve migration accuracy > optimized the scheduler time calculations, but broke posix-cpu-timers. > > The problem is that the p->last_ran value is not updated after a context > switch. So a subsequent call to current_sched_time() calculates with a > stale p->last_ran value, i.e. accounts the full time, which the task was > scheduled away. > > Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]> > > Index: linux-2.6/kernel/sched.c > =================================================================== > --- linux-2.6.orig/kernel/sched.c > +++ linux-2.6/kernel/sched.c > @@ -3566,7 +3566,7 @@ switch_tasks: > > sched_info_switch(prev, next); > if (likely(prev != next)) { > - next->timestamp = now; > + next->timestamp = next->last_ran = now; > rq->nr_switches++; > rq->curr = next; > ++*switch_count; >
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